Brake for cycles.



Patented Sept. 2, I902.

w. BRANKOWITCK BRAKE FOR CYCLES (Appl t on filed Nov. 15', 1901.

(No Model.)

WITNESSES ATTORNEY UNITED STATES PATENT OFFICE.

WLADIMIR BRANKOWITCH, OF PARIS, FRANCE, ASSIGNOR TO ALBERT MATIFAT AND00., OF PARIS, FRANCE.

BRAKE FOR CYCLES.

SPECIFICATION forming part of Letters Patent No. 708,197, datedSeptember 2, 1902. Application filed November 15, 190 1. Serial No.82,488. (No model.)

To (ZZZ whom it may concern:

Be it known that I, WLADIMIR BRANKO WITCH, a subject of the King ofServia, residing at Paris, France, have invented certain new and usefulImprovements in Brakes for Cycles and I do hereby declare the followingto be a full, clear, and exact description of the invention, such aswill enable others skilled in in the art to which it appertains to makeand use the same.

This invention relates to brakes for cycles, and has for its object toprovide an improved device of this class to be applied to the rearwheel, in which are improved independent driving and braking meanswhereby driving and stopping are facilitated and slipping or failure ofaction of the parts are avoided.

With this object in view the invention consists in the improvedconstruction, arrangement, and combination of parts hereinafterdescribed and afterward specifically claimed.

In the accompanying drawings, Figure 1 is a partial sectional view of adriving-wheel hub constructed in accordance with my invention. Fig. 2 isa detail perspective view of the split braking-ring detached. Fig. 3 isa similar View of the sprocket driving-wheel. Fig. 4 is a similar viewof the split drivingring. Fig. 5 is a tranverse sectional view of thesprocket-wheel engaged with driving and brake rings of a modifiedconstruction. Fig. 6 is a view in elevation of the pinion and back ringshown in Fig. 5. perspective view of the modified form of brake ring,and Fig. 8 a similar view of the modified form of driving-ring.

Referring to the drawings, Figs. 1 to 4, a

indicates the hub of the driving-wheel, upon which are threaded tworings 1) and c, the former of which is used in driving and the latter inbraking the cycle. The sprocketwheel is indicated at d and is providedon one side with fourinclined cam-surfaces e, e, 6 and a F indicates asplit driving-ring provided with cam-surfaces f f to engage thecam-surfaces 6 9 of the sprocket-wheel d. Gindicates a splitbraking-ring provided with cam-surfaces g g to engage the cam-surfaces e e of thesprocket-wheel d. When pedaling forward, the sprocket d, which is heldlaterally between the ring I) and a part It fixed Fig. 7 is a detail.

to the frame of the machine, gives, by the engagement of its inclines ffwith the cam-surfaces 6 6 a rotation to the ring F, which is thenbrought close against an incline b of the ring 5, and thus produces therotationof the hub and wheel. At that time the ring G revolves freelywith the pinion without any effect. Upon ceasing action upon the pedalsthe ring F has a tendency to disengage the ring band is moved laterallyto its first position, and the cycle may run under the influence of-theac uired speed without any motion of the pedals; but should the pedalsbe actuated backward the ring G will come into action through thecontact of e 6 with the inclines g g, the ring G pressing against theconical part h of the piece h and causing the braking of the latter atthe points 10 against the walls of the extension-ring it, connected tothe piece 0 by means of a pin Z. A forward-motion of the cycle may thenbe obtained again by pedaling normally, as explained above. The pinionillustrated in the annexed drawings has four cam-surfaces to correspondin pairs with the two lateral inclines of each of the two conical rings.

Referring now to Figs. 5, 6, 7, and 8, which represent a modified formof construction, with rings rigid instead of split, Fig. 5 shows the twoinclines of the rings in engagement, and Fig. 6 is the pinion with theback ring in place, the front ring being removed and the two rings beingshown, respectively, in perspective in'Figs. 7 and 8. The pinion m isprovided, for example, with three inclined closed notches m m m and therings n and o are each provided with three inclines, as n n n and o o 0in such relation that pairs n and o n and c are adapted to engage eachother through the respective notches by passing in pairs into the samenotches, as m m,- &c., of the pinion. The operation is the same ,as inthe before-described device, (construction ofFigs. 1 to 4,) and thesolidity of rings at and 0 secures absolutely their approach to eachother and as sures the perfect operation of the parts without sliding orfailure to engage.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent of the United States, is

In brakes for cycles, the combination with the driving-wheel hub and tworings, as Z) and c, threaded thereon, of the sprocket-wheel ward,cam-surfaces of the sprocket-wheel a1- ternating with those engaged bythe inclines of the first-mentioned wheel, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

WLADIMIR BRANKOWITCH.

Witnesses EMILE GRIMONT, VICTOR PREVOST.

